Thomas nortiiey



(No Model.)

T. NORTHBY.

DOUBLE ACTING PUMP.

WITNESSES:

Ntra rares- ArnNr @einen DOUBLE-'ACTING PUMP.

SPECIFICATION forming part of Letters Patent No.

Application lilod June 7, 1&3.

345,253, antec only e, 188e.

Renewed April il, i835. Serial No. 1Gl,'2. (No model.)

T all whom it may concern.- l.

Be it known that I, Trronasdoeriiiav, of Toronto, Province of Ontario, Canada, have invented certain new and uscl'nl improvements in Double-Acting Pum ps, of which the following is a Specification.

This invention has reference to certain improvements in double-acting` pumps in which the piston is connected directly to the piston'- 1o rod of a steanrengine, or driven by any other suitable power, and in which the suctionchaniber is provided with a suctioncavity equalizing theiniiow of iiuid; and the invention consists, first, of a novel connection of the pump-cylinder with the surrounding pumpcasng, so as to admit the expansion and contraction of the former; secondly, of a novel construction of the airchamber,which is provided with an interior perforated pipe that is 2O covered by a continuons elastic diaphragm;

and, lastly, of certain details Ol construction which will be more fully pointed out in the Specification, and finally be defined in the claims.

In the accompanying drawirqgs, Figure l represents a side elevaiion ol' my improved double-acting pump, One-half being shown in verticallongitudinal section. Fig. 2 is a vertical transverse section of the same on line .c 30,50, Fig. l, the air-chamberbeiug removed; and

Figs. 3 and 4 are respectively a vertical transverse section of one of the valves and Avalveseats, and a top view of the valve-seats.

Similar letters .of reference indicate corre spending parts. l

Referring to the drawings, A represents the pump barrel or cylinder, which is made of brass or other suitable metal, and secured to the interior of a cylindrical lower portion, C, of

4o the pump-casing B. The casing C is concentric to the pump-cylinder, and provided at its middle portion with an interior projecting and Iscrew-threaded collar, e, into which is screwed thepump-eylinder A by an exterior threaded"l 4 5 circumferential projection, b. The pump-cylinder A is provided next adjoining to the projeetion b with a collar, b', that abuts against \the collar a when'the c 'inder'-Allas been fhj'lly screwed in. At the outer end of the 5o pump-cylinder A, o'n the same side to which the collar b 1s applied, is arranged a second collar, b2, (shown in dottedlines in Fig. 1,) which has at diarnetrieallyopposite points recesses 1) for the insertionfof a wrench, by which the pump-cylinder is screwed into position. der is turned ofi' smooth and accurately fitted to the imvardly-projecting lugs d at the opposite end of the cylindrical portion C.

Between the central threaded projection, b, and collars b' b2 at one end of the pump-cylinder and lheinterior collar, a, and lugs d d of the cylindrical portion G of the casing B annular cavities are formed at both ends between the cylinder and casing, in which the water can freely play, so las to avoid not only any undue pressure on the cylinder, but also the danger of freezing, as the water in the cavities is drained ol'f through the bottom openings, c c, of the pump-casing Gafter use, which are lghlly closed during the working ol' the pump. Another advantage of theeonneclion Ol' the pumpcylimler, especially when pumping hot water, is that the cylinder can expand and contract in either direction without disturbing its connection with the pumpcasing or without injury to the pump-cylinder itsel t'.

Above the pump-casing C is arranged the suction-chamber lll, which is connected with th x. opposite ends of the pump-cylinder A by eldtnnels l) l). lhe suetionchamber E is provided at its center with a dome-shaped sue tion-cavity, F', which is' located at the inside of the pnmpeasing interinediately between the suction and delivery valves, and as near as possible to the inletopening o of the sueton-pipe, for Ithe purpose of preventing the irregular action or cbbing and flowing of the water in the suction-pipe and suetion'chaniber at the return-stroke of the pump. water flows up into the suction-cavity the thumping and hammering of the water in the suction-pipe and pump are prevented, and thereby a main objection to the steam or other pumps heretofore in use overcome. rlhis suetion-cavity forms a receiver or receptacle for the incoming water, which'equalizcs the flow of the saine.

Above the suetionehamber E and its valve is arranged the delivery-chamber F F, which communicates with the suction-chamber by The opposite end of the pump-cylin- As the openings and valves in the usual is provided with anorifice, o', for the deliverypipe at one or both sides, according as a delivery-pipe at one or both sides of thc pump is to be used. The suction and delivery chambers E and F are provided with valve-seats 7L for the valves H and I-I. The valves are cushioned, so as to slide on their stems h h, by spiral springs h2. The faces of the valve-seats h or of the valves are provided with annular ridges or projections h3, which ridges produce the more intimate closing of the valves. From the seats of the suction-valves H projections or lipsz' extend in upward directiomby which the suction-valves H are protected against the upward current of the wat-er passing u p in the channels D to the delivery-chamber F. At the upper part of the delivery-chamber F are arranged inwardly-projecting horizontal lips i i', (shown in Fig.V 2,) by which the flow of the water to and through the delivery-pipe is equalized. Above the delivery-chamber F is arranged an air-chamber, G, at the interior of which is\arranged an upright,perforated pipe, g. An elastic diaphragm, g', .extends around the exterior circumference of the pipe g, and is secured to ashoulder, y, at the base of the same by a metallic ring, g. This ring is again held in position by an inwardlypro- 30' jecting shoulder, g, of the exterior casi ng ofthe ient in putting up the pump.

air-chamber G, between which and the rubber diaphragm ganair-spaceis formed, that serves to cushion the diaphragm, while the latter forms an expansible chamber for the water in the perforated pipe (7. By tlzis construction of the airciiamber the air cannot escape, as is the case in air-chambers ot' the nsual construction, so that it forms a very effective aircushion for the water, while the air-space around the elastic diaphragm will always he kept intact and forman air'cushion for the diaphragm g', which vihrates back and forth, according to the pressure exerted thereon by Ihe water. The pump is closed at the sides by means of side plates, B', which are removable in order to examine the valves. The side plates, B', arc reversible, so that the pump can be fitted up with the suction -pipe o at either side of the p ump-caein g, as most con venducti'ng channels at the interior of the pumpcasing are rounded off and so proportioned that the Water flows easily through thc same Without being obstructed by sharp corners or contracted channels, -so as to facilitate the Working of the pump and render the same more effective in use.

manner. It l Having thus described my invention, Iclaim as new and desire to secure by Letters Patent* l. The combination, with the pump-casing I3, having a cylindrical portion, C, of a pumpcylinder, A, connected thereto at its center and fitted thereto by projections at both ends, so as to form intermediate cavities for the free play of the water, substantially as set forth.

2. In adouble-acting pump,the combination of the cylindrical casing C, having a threaded projection, a, at its middle part, `and lugs d d at one end thereof, with a pump-cylinder, A, having an exterior threaded portion, b, a co1- ]ar, b', adjoining the same, and a collar, b, at the end opposite to the lugs of the casing, the collarb2 being recessed to apply a wrencl1,snb stantially as and for the purpose set forth.

3. In a double-acting pump, the frame supporting the suction-val ves, located beneath the delivery valves and provided with upward- 1/projecting guards or lips t', as and for the purpose shown and set forth.

4. ln a double-acting pump, the deliverychamber F, provided with inward] y-p roj eeti n g lips iz", for the purpose of causing the easier tiow of water to the delivery-pipe, substantially as set forth.

5. The combination ofa a suction-chamber, E, having a central upwardly-extending suction-cavity, E', suction and delivery Valves H I-I at both sides of said cavity, a delivery-chamber, F, and an airchambcr, G, provided with au interior perforated pipe, g, inclosed by an exterior elastic diaphragm, g', substantially as set forth.

6. ln a double-actingpu mp, an air chamber, G, having an interior perforated pipe, g, and an elastic diaphragm, g, extending around the perforated pipe and secured to the base of the same, snbstantiall y as set forth.

7. In a double-acting pump,the combi nation of an exterior closed air-chamber, G, an interior perforated pipe, g, an elastic diaphragm, y', extending around the perforated pipe g, a fasteningring,g", by which the diaphragm is secured to the base g2 of the perforated pipe,

pump-cylinder, A,

and 'au annular lug or collar, g, of the airchamber by which the fasteningring g is retained in position, substantially as described.

ICS

In testimony that I claim the vforegoing as my invention I have signed my name in pres.- ence of two subscribing witnesses.'

THOMAS NORTHEY.

Witnesses:

PAUL GoEPEL, SIDNEY MANN. 

